package cn.tedu._05weibo.interceptors;

import cn.tedu._05weibo.common.response.JsonResult;
import cn.tedu._05weibo.common.response.StatusCode;
import cn.tedu._05weibo.pojo.vo.UserVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@Slf4j
public class UserLoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
         /*
            拦截器实现登录状态校验
            1. 获取session对象
            2. 获取session中的用户信息
            3. 判断 userVO 是否为空
                3.1 不为空,放行 return true
                3.2 为空,重定向到登录页面login.html, return false
                    response.sendRedirect("login.html);
         */
        HttpSession session = request.getSession();
        UserVO userVO = (UserVO) session.getAttribute("user");
        log.debug("userVO = "+ userVO);
        if (userVO == null) {
            response.sendRedirect("/login.html");
            return false;
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
